Car transmission jacks are divided into mechanical jack […]
Car transmission jacks are divided into mechanical jacks and hydraulic jacks. The principle is different. A long time ago, engineers used hydraulic jacks. Today, as long as the hydraulic crane can be seen in the parking lot or gas station, it can be used to make a child's strength to lift a car. Hydraulic jacks are based on the principle of Pascal's principle, the pressure of the liquid is the same, so that in a balanced system, the pressure exerted on the relatively small piston is relatively small, and the pressure exerted on the large piston is relatively large, so that the pressure can be maintained The liquid is still. Therefore, through the transfer of the liquid, different pressures on different ends can be obtained, so that a change can be achieved. Our common hydraulic jacks use this principle to achieve the transmission of force.
The mechanical jack adopts the mechanical principle, moves the handle, pushes the ratchet wheel to rotate, and the pinion drives the large gear to rotate the weight lifting screw so that the lifting sleeve can be raised or lowered to achieve the lifting pulling function, but not as easy as the hydraulic jack. .
Here are some common Car transmission jacks. Rack jacks are used to lift heavy objects by levers and gears driven by humans. The lifting weight generally does not exceed 20 tons, and can support heavy objects for a long period of time. It is mainly used in places where the working conditions are not convenient or where there is a need to lift the heavy objects with the lower claws, such as railroad tracks.
Screw jacks are driven by humans through screws, screws or nut sleeves as lifting members. Ordinary screw jacks rely on screw self-locking to support heavy objects. Jacks of this type are simple in construction but have low transmission efficiency. The screw of the self-propelled screw jack is not self-locking, but it is equipped with a brake. Heavy objects can quickly fall by themselves, shortening the time, but this type of jack construction is more complicated. Screw jacks can support heavy objects for a long period of time, with a maximum lifting capacity of 100 tons and a wide range of applications.